Bearing Shell and Method For the Production Thereof

ABSTRACT

The invention relates to a method for producing a bearing shell comprising two circumferentially extending oil grooves. According to said method, a rectangular blank is cut from a strip stock, and said blank is shaped into the bearing shell. The oil grooves are introduced into the blank by die-cutting two cavities which extend from the narrow sides in the longitudinal direction of the blank at a maximum angular range of 60°.

The patent pertains to a manufacturing method for a bearing with two oil slots extending in peripheral direction, in which from a strip material, a rectangular plate is detached and molded to the bearing.

Bearings of this kind are deployed as bearings in crankshaft beds. For example, U.S. Pat. No. 4,017,127 and U.S. Pat. No. 4,714,356 are used in such a manner that the oil slots only cover a limited angle range, which is limited by the manufacturing method. The oil slots are specifically included by milling activity in the completed bearing, which only permits a groove length over an angle range of at most 45 degrees.

In order to procure better lubricant supply in the vertex, an extension of the lubricant slot is desirable. In the DE-OS 26 17 843, a bearing, in this regard, three oil slots, successively arranged in peripheral direction, are being cut into the bearing as grooves, with a disk molding cutter. The oil slots run out in peripheral direction on both sides respectively in the form of cylinder shells, so that bars remain between the oil slots and in the range of the partial areas of the bearings. At the same time, these bars interrupt lubricant supply however as well.

At the same time, an expansion of the flow cross-section is aimed for, which leads, in the case of oil slots with a groove ground to a reduction of material in the groove ground.

As a result, the stability of the bearing admittedly suffers. An expansion of the oil slot is only possible in a limited way, because this would be accompanied by a narrowing of the wing section.

The function of the patent is to prepare a manufacturing method which avoids the disadvantages referred to. It is also the function of the patent to specify a corresponding manufacturing process.

The function is fulfilled by a manufacturing process with the criteria of claim 1.

It has been publicized surprisingly quickly that the stability of the bearing is not adversely affected if, where the oil slot is located near the known bearing, a slit-shaped opening is made. The openings are preferably axially located, so that on both sides, two equally large finger-like areas remain. The cross-section of the openings is clearly enlarged, through the elimination of the material in the ground of the groove, through which an oil channel is made. For the depth of these oil channels, the total thickness of the bearing is available.

The process for the manufacturing of such a bearing in which from the strip material the rectangular plate is removed and the plate reshaped to the bearing, provides for the insertion of the oil slots in the plate, in which slit-shaped openings which extend from the quoins along the length of the plate over an angle range from up to 60 degrees, are cut.

The laborious milling action required for the manufacture of the oil slot in the ready bearing is omitted, because the openings are already provided in the manufacture of the plates.

It is possible as a result of that to manufacture openings extending across a larger angle range than 45 degrees of the ready bearing.

The cutting action can be conducted during the detachment of the plates from the strip material. The detachment and cutting are preferably carried out in one operation, so that no losses of time arise in the manufacture of the plates.

In order to introduce the ramp-like section on the inside of the openings, a corresponding operation on the plate or on the ready bearing is provided.

This ramp-like section is preferably milled in, which if necessary can also be performed on the ready bearing.

Exemplified implementation forms of the patent are further commented upon on the basis of diagrams

showing

FIG. 1 a bearing in perspective display

FIG. 2 a cross section along line II-II through the bearing displayed in FIG. 1

FIG. 3 a cross section in accordance with FIG. 2 of a bearing in accordance with a further implementation form, and

FIG. 4 a schematic depiction of the manufacturing process for the plates for the manufacture of the bearings

In FIG. 1, bearing 1 is displayed, showing partial areas 2 a and 2 b. From partial areas 2 a and 2 b, slit-shaped openings 4 a and 4 b extend in peripheral direction in the direction of part 7. These slit-shaped openings are preferably axially arranged between both front ends, so that on both sides broad fingers 5 a and 5 b, and 5 c and 5 d respectively remain. In the situation as installed, the slit-shaped openings 4 a and 4 b serve as oil channels 3 a and 3 b, and replace the conventional oil slots.

In FIG. 2, a cross-section along line II-II of bearing 1 depicted in FIG. 1. Angle range a, over which both openings 4 a and 4 b extend, is designated a. The charter range extends over app. 60 degrees.

In FIG. 3, a further implementation form is depicted, in which on the interior ends 8 a and 8 b of the openings 4 a and 4 b, respectively, there is a ramp-like section. This ramp-like section has the function of transporting oil flowing in the direction of the part to the inner surface of the bearing, in order to achieve the desired lubrication there.

In FIG. 4, strip material 10 is depicted, from which along separator 11, plates 12 are removed. On quoins 13 a and 13 b of plates 12, openings 4 a and 4 b are cut. This cutting can be combined with the detachment of plates 12, if corresponding cutting knives are used.

REFERENCE NUMBERS

-   1 bearing -   2 a,b partial areas -   3 a,b oil channel -   4 a,b opening -   5 a,b,c,d finger -   6 a,b ramp-like section -   7 vertex -   8 a,b inner end -   10 strip material -   11 separator -   12 plate -   13 a,b quoin of the plate -   a angle range 

1-5. (canceled)
 6. Method for the manufacture of a bearing with two oil slots extending in peripheral direction where from a strip material a rectangular plate is detached and this plate is recast to the bearing wherein the oil slots are inserted in the plate, in which two openings extending from the quoins in longitudinal direction along the plates over an angle range of up to 60 degrees are cut.
 7. Method according to claim 6, wherein the openings are cut during the detachment of the plates from the strip material.
 8. Method according to claim 7, wherein detachment and cutting are carried out in one direction.
 9. Method according to claim 6, wherein a ramp-like section is inserted in the plate or in the baring on the inner end of the openings, respectively.
 10. Method according to claim 9, wherein the ramp-like section is milled. 